一个六面色子扔10次,正好只有一次六的概率是多少,如果已经知道至少已经扔了一个六?原题是A single die is rolled 10 times.What is the probability that a six is rolled exactly once,if it is known that at least one six is rolle?
问题描述：
一个六面色子扔10次,正好只有一次六的概率是多少,如果已经知道至少已经扔了一个六?
原题是
A single die is rolled 10 times.
What is the probability that a six is rolled exactly once,if it is known that at least one six is rolle?
答
如果已经扔了一次6
那么也就是其余9次都不是六,p=(5/6)^9
如果已经扔了超过1次6
那么很明显概率是0了